how to travel to Zhujiajiao with family on dec 30 - january 1

Hi, the famous town is located at Shanghai city. So you need go to Shanghai from Hong Ko ng first. As you will have this trip together with three children, I suggest you take a direct flight.
Upon arriving at the local airport, you can take subway line 2 to People's Square. Then you can take Huzhu Express Line at People's Square Pu'an Road Jinling Road and arrive in Zhujiajiao one hour later. There is a bus every half an hour.

Or you can take the airport shuttle bus to Hingqiao Airport directly. There you can take two taxis to your destination.